LEFT FLIGHT
MANAGEMENT
COMPUTER

FWD
SEE E
MAIN EQUIPMENT CENTER
Flight Management Computer System - Component Location Figure 1 (Sheet 1)
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MAINTENANCE MANUAL

CRT

LINE SELECT KEYS
FUNCTION KEY
ANNUNCIATORS
NUMERIC ALPHABETIC CHARACTER CHARACTER KEYS KEYS
CONTROL DISPLAY UNIT

A
Flight Management Computer System - Component Location Figure 1 (Sheet 2)
C22656
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MAINTENANCE MANUAL

EICAS CONTROL PANEL/FMC SWITCH

CAPTAIN'S F/O'SSOURCE SELECT MODULE

Flight Management Computer System - Component Location

Figure 1 (Sheet 3)

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MAINTENANCE MANUAL

TEST FAIL LAMP
TEST IN PROCESS LAMP
TEST INITIATE PUSH BUTTON
DATA LOADER
CONTROL PANEL

F

Flight Management Computer System - Component Location
Figure 1 (Sheet 4)

M48968
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MAINTENANCE MANUAL

AIRBORNE DATA LOADER

DISKETTE STOWAGE BOX
ON AIRPLANES WITH A DISKETTE STOWAGE BOX

Flight Management Computer System - Component Location Figure 1 (Sheet 5)
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 C.  In additon to airplane guidance and thrust control, the FMCS 's navigation function controls the tuning of the VHF NAV radios for VHF NAV position updating. This VHF NAV radio computed position is combined with the three inertial positions computed by the Inertial Reference System (IRS) to provide a more accurate present airplane position fix.
 D.  The Control Display Units (CDUs) provide a means of communication between the crew and the FMCs. This interface allows for crew entry of intitialization data, reference data, modifications in the flight plan as well as displaying information on airplane configuration and advisory/alerting messages.
 E.  In addition, the CDU operates as a control panel for systems such as ACMS and CMC as well as to provide backup functions for navigation, radio tuning and EFIS/EICAS panel control.
 F.  Although the FMCS controls a portion of the flight management system, the airplane and interfacing systems are able to operate without it.
 G.  The sections which follow briefly describe the FMCS's (FMCs and CDUs) hardware structure, system interfaces, navigation, guidance, performance and thrust management functions and their computations.
　
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